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Патент USA US2133575

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Patented oci. 18,1938 Y
,
.
_ 2,133,575
UNITED STATES PATENT OFFICE
2,133.575
PRESSURE RELIEF VALVE
- Philip S. Rosenberg, Lockport, N. Y., assìgnor to
General Motors Corporation, Detroit, Mich., a
corporation of Delaware
Applieatißn May 2, 193s, serial No. 71,439
'
4 claims.
(ci. g77-_45)
This invention relates to circulating liquid cooling systems for internal combustion engines and
on the opposite side, there being associated with
the outlet header 3 an expansion tank 4 which
more particularly to an automatically controlled
extends over and across the top of the Ícore i.
At its lower end the outlet header 3 is provided
with a suitable fitting for connection through the 5
hose 5 with the suction side of an engine driven
vent for a system to be operated under internal
‘5 pressure.
It is an object of the present invention to pro-
vide in a closed system an improved valve struc- ` pump 6 on the front face of the jacketed engine
ture which is characterized by simplicity, cheapness, reliability and carefree attention.
10
As is well understood, a closed system aids
slightly to cooling efficiency and its use is currently in favor. Such systems incorporate relief
valves for excess pressures and the problem has
been to obtain a..vent valve which is free of com-
l5 plications and gives satisfactory performance
over- a long period. With these things in mind
there is contempla‘ted a design having a minimum
block l. Power from the engine is transmitted
through the belt 8 to drive the pump â and also
the radiator fan 9 and the cooling water after 10
being circulated through the cylinder block and '
absorbing heat leaves the engine through the
hose connection I0 and enters the inlet header
2 for passage across the core where its heat is
absorbed by a stream of air drawn through the l5
radiator by the engine driven fan 9. ,
Any suitable means may be provided for ñlling
number of parts all easily manufactured and assembled at low cost. More particularly the novel
20 structure in its preferred embodiment consists
the system with cooling liquid, but for the sake of
simplicity the drawing shows a standpipe or filler
spout Il associated with the inlet tank iitting 20
of a spring pressed valve associated with the
usual overflow vent of the radiator assembly and
made up of a sealing disc'of resilient rubber and
a backing plate therefor, the rim/of the rubber
25 disc being arranged for sealing engagement with
an annular seat in the overiiow pipe and the centra] portion being apertured and adapted for surfaoe engagement with the backing plate to seal
the aperture under internal pressure and for de-
and closed by a detachable cap l2. As will be
evident from the drawing the top of the iiller
spout Il terminates at the top of .the radiator
core and below the level of the expansion tank ê
and its height determines the maximum level to 25
which the system may be fllled. When the liquid
heats up 1113011- engine *Operation its whim@ QX
pands and the excess water enters the expansion
tank l for subsequent return to the circulating
30 ñection from the plate to provide communication
system when the liquid body contracts, thereby 30
between the aperture and an opening in the back-- insuring system operation at full capacity at all
ing plate under external pressure. Thus the rub~ times. If the system is completely closed to at
ber disc forms an eiîective seal against internal mosphere the expansion of the liquid compresses
pressure as long as the valve is seated. the spring the air within the top tank 4 and the higher pres
35 being calibrated or selected to allow the valve ` sure raises the boiling point of the liquid and in- 35
to-open for the relief of pressureÍ in' excessl of a creases its ability to transfer heat from the en
predetermined value and the disc itself, by rea- ‘ gine to the radiator.
son of its eiasticity, yielding under inñuence of
external pressure to avoid an internal sub-at_ 4o mospherlc pressure condition.I
core bursting or of leakage through the hose 40
For a better explanation of the invention ref-
Hence _iS made t0 the aCCOlIlDanying drawing
wherein Figure l is a side elevation of an engine
and cooling radiator assembly; Figure 2 shows a
45 fragment of the radiator as viewed from the rear;
Figure 3 is a section taken on line 3-3 of Flgure E; Figure 4 shows the valve elements in perspective; Figures 5 and 6 are sectional views il- _
lusïraîing different Positions assumed by the
5o valve elements, and Figure 7 iS a Sectional- view
showing a modification.
However. if the pressure is
allowed to build up beyond a few pounds there
would be the likelihood of the relatively fragile
,
Referring t0 the drawing the numeral l indi-
connections and pump packings, and it; is neces..
sary,rtherefore, that a check be placed on the
extent to which the pressure may go. For this
purpose a pressure actuated valve can be asso
ciated with the usual overflow leading from the 45
top of the expansion tank #i for the automatic
regulation of pressures.
iAmm-ding t0 the present invention, the over
ñow vent tube comprises two sections I3 and il
with a suitable valve therebetween, the section Il 50
leading downwardly at one side 'of the radiator
assembly for convenient discharge at the bottom
cates a heat exchanger unit 0r radiator Core 0f ~ thereof. The-valve- casing in this instance is
the cross ñow type having an inlet tank 0r headformed of a pair of stampings l5 and I6 nested
55 er ii on one side and au outlet header or tank 3 one within the other and having projecting from g5
2,188,575
2
opposite ends tubular extensions i1 and I8 for
sleeved connection with the adjacent ends of the
pipe sections I3 and I4. Optionally the stamped
cup I5 may be formed as an integral part of one
wall of the expansion tank 4 by depressing a por
tion of the wall to cup shape as seen in Figure ‘7
to receive the stamping I6. Formed in the base
of the cup i5 is an inwardly- projecting rib I9
wall of a system tank providing an annular skirt
and an inturned ilange, a raised rib in said ilange
about the central aperture for seating ayalve, a
cap iltted and sleeved to said skirt for coopera
tion with the depression in affording a valve
chamber, a valve floating Within the chamber and
comprising an initially fiat elastic disc and a still
backing plate having a central conical portion
that provides an annular raised seat for a spring - stressing the disc to insure tight face to face con
10
tact between the disc and plate, a coil spring 10
pressed valve.
The valve includes a disc 20 of rubber or other
elastic deformable material secured within ‘down
turned tongues or flanges 2| of a relatively stiff
backing plate 22 which may consist of a sheet
15 metal stamping. A coil spring 23 of suitable pre
selected strength seats at one end against the base
of the cup I6 and'at the other end against the
backing plate 22 to hold the rim of the rubber
disc 20 in sealing contact with the annular seat
20 I9 in opposition to internal -pressures below the
value of the spring resistance. When the in
ternal pressure exceeds the resistance of the spring
the valve is lifted from its seat as shown in Fig
ure 6 for the relief of pressure until a balance
25 is established.
When the liquid within the system contracts as
a result of subsequent loss of heat, it is desirable
that the internal pressure shall not fall below the
external or atmospheric pressure. Advantage is
30 here taken of the inherent elasticity of the rubber
disc for establishing communication between op
posite sides of the valve when the external pres
sure predominates. To this end, the center of
the disc may be apertured as at 24 and the back
ing plate may be provided with one or more open
ings 25 arranged beyond or out of line with.the
central aperture 24 in the resilient disc. These
openings are sealed from one another. by the
tight surface engagement of the disc 20 and plate
40 22, particularly when the valve is seated and the
system is operating under internal pressure, in
asmuch as the internal pressure tends to press
the surfaces into closer engagement. As an addi
tional safeguard in this connection the rubber
disc 24 may be formed of initially fiat material and
45
the central portion of the plate 22 can be p'ressed
inwardly to slight conical shape whereby upon
assembly the rubber disc will be deformed slightly
and be under a small initial tension.
Deflection of the rubber disc 24 will occur as
50 seen in Figure 5 when internal pressure is below
atmosphere, to provide communication between
the openings 25 and 24 for the free flow of air
from one side of the valve to the Iother until
balanced relation is again established. Thus the
55 cooling system -will never be caused to operate
under a condition of sub-atmospheric pressure but
on the contrary pressure operation is insured from
almost the very beginning when the cooling liquid
is at an initial low temperature. This will be
60 particularly advantageous when the cooling sys
tem is being operated on an antifreeze solution
which normally has a relatively low boiling point
since the operation under prèssure reduces the
likelihood of vaporization.
65
I claim:
-
1. In a pressure valve organization for an
engine cooling system. a system vent including a
centrally apertured cup-shaped depression in one
seated at opposite ends on the cap and the back
ing plate to seat the disc on the raised rib in said
flange, said disc and plate having spaced open
ings adapted for communication upon deflection
of the disc away from the plate, the opening in 15
the disc being in alined relation with the apex
of the conical portion of the plate.
.
2. In a pressure valve organization for an
engine cooling system, a valve chamber compris
ing a pair of stamped metal cups nested to
20
gether with reduced pipe connecting extensions
at opposite ends thereof, an annular raised rib in
the base of one of said cups, a valve spring housed
within the chamber and seated at one end against
the base of the other cup, a stiff conical plate
seating the otherv end of said spring, an initially
ñat rubber disc carried by and stressed to con
form with the plate to insure a close ilt of the
disc and plate and arranged to seat on said raised
rib and cooperating ports in the plate and disc
in out of line relation with the apex of the conical
plate projecting into the port in the disc.
3. In a pressure valve organization for an
engine cooling system having an overflow passage,
a valve assembly adapted to be incorporated in 85
said passage and including a pair of stamped cups
having skirt portions telescopically sleeved to
gether to provide a valve chamber, each cup hav
ing a centrally apertured base portion for pro
viding communication between the chamber and
the interior and exterior of the system, respec
tively, a raised annular valve seat about the aper
ture in the base of one of the cups, a distenslble
valve disc bearing near its periphery on said
raised seat and having a central opening there
through, a stiif backing plate of substantially'
conical shape having its apex projecting into the
central opening of the disc and stressing the disc
to conform thereto, said plate having an open
ing therethrough offset from said apex, and a
coil spring bearing at one end on the backing
plate in line with the raised valve seat and at its
opposite end on the base of the other cup.
4. A double acting valve mechanism including
a casing having a valve seat, an initially fiat 55
resilient member having a central opening and
being adapted to seat near its periphery on said
seat, a stiiI backing plate having a central conical
portion to engage and deform said member to
substantially frusta-conical shape, with'the apex
of the conical portion projected into the central
opening of said member for a stress ilt to the
circular edge thereof, said plate having an open
ing spaced from the apex thereof for communica
tion with the central opening in said member
upon additional member deformation. and ‘a
spring bearing on the plate and yielding to move
ment of the member away from said valve seat.
PHILIP S. ROSENBERG.
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